A number of matte render elements serve as masking or blocking certain parts of the render in the post-production process.
The Render ID Render Element creates selection masks based on the node handle of each object or the V-Ray assigned render ID.
Active – Enables the render of the channel.
Denoise – Enables the render element's denoising, provided the Denoiser render element is present.
Consider for AA – By default, the Image sampler applies AA based on the RGB image. When this option is enabled, the Render Element is considered for AA.
Filtering – When enabled, it applies the antialiasing filter to the render element.
Color Mapping – Applies the default color mapping options to this render element (Reinhard).